To avoid the sag and breakage of an outer peripheral part and the generation of air bubbles in the outer peripheral part to enhance quality, in an optical element widely used in glasses or the like having a reffraction surface formed thereto by a mold, by molding an intermediate body having a peripheral edge shape larger than that of a completed object before obtaining a product.

In producing an optical lens (completed object), at first, an intermediate body having a peripheral edge shape larger than that of the completed object is molded. That is, a projected mold 4 and a recessed mold 5 for molding the intermediate body are positioned at a desired interval and a self-adhesive tape 6 are wound around the side surfaces of both molds 4, 5 to be fixed thereto. Next, the space demarcated by the molds 4, 5 and the self-adhesive tape 6 is filled with a plastic raw material such as a monomer and the plastic raw material is cured to mold the intermediate body 7. Subsequently, the intermediate body 7 is held on a block jig 9 through a low m.p. metal in a shape forming process and the jig 9 is attached to the chuck of a cutter and the intermediate body 7 is molded to obtain the completed object.